https://github.com/davepinch/pinchy.cc/blob/master/content/topics/astronomy/catalogs/ngc/ngc-4945/ngc-4945.md
The Cretaceous (along with the Mesozoic) ended with the Cretaceous–Paleogene extinction event, a large mass extinction in which many groups, including non-avian dinosaurs, pterosaurs, and large marine reptiles, died out, widely thought to have been caused by the impact of a large asteroid that formed the Chicxulub crater in the Gulf of Mexico.
